PVPh-co-PMMA/PEO blends

Chang et al. reported the miscibility of poly(vinylphenol) (PVPh) with poly(methyl methacrylate) (I MMA) Figure 1 shows the C CP/MAS spectra of pure PVPh, PMMA, PVPh-co-PMMA, PEG, and PVPh-co-PMMA/ poly(ethylene oxide) (PEO) blends of various compositions with peak assignments. VPh contents of PVPh-co-PMMA is 51 mol% and Mn of PEO is 20,000. The spin lattice relaxation time in the rotating frame (Tip ) was measured to examine the homogeneity of PVPh-co-PMMA/PEO blends on the molecular scale. 

Table 1. Tip (ms) values of pure PVPh and various PVPh-co-PMMA/PEO blend compositions...

Table 1 also shows that both pure PVP and PVPh-co-PMMA/PEO blends exhibit only single-exponential relaxation through out all of the blends at... 

A typical value of D is 10 m" s . For Ti of 5 ms, the dimensions of these PVPh-co-PMMA/PEO blends are below 2-3 nm in the amorphous phase. Interestingly, the has a minimum value for the PVPh-cu-PMMA = 40/60 blend showing that the overall chain mobility is maximal at this composition. This observation agrees with the earlier result concerning hydroxyl group association obtained by FTIR and solid-state NMR. In addition, all of the blends show a shorter Ti,/ than that of the pure PVPh-co-PMMA implying that the PVPh-co-PMMA mobility also increases with the increase of PEO content. 

Figure 20.18 FTIR spectra recorded at room temperature in the 2700-4000cm region for pure PVPh and various PVPh-co-PMMA/PEO blends, (a) pure PVPh (b) 100/0 (c) 90/10 ...

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